Mobo - ASUS A7N8X-X (really cheap and fast)
Ram - 256 MB Generic
CPU - AMD Xp2500
HDD - 40 segate
= about $400AU or $250US
also if you need a case i recommend the Thermaltake XASER3 V2000A with thermaltake 480watt Gold PurePower Model W0011, if you got a bit of money left over
<A HREF="http://service.futuremark.com/compare?2k1=6973142" target="_new">3dmark2001</A>
2.4C @ 3.0G
Asus P4C800
Corsair 2x512 3200
Sapphire 9600pro @ 500/700
80G Seagate S-ATA150